Alas, you said that this LED screen looks bright and beautiful. How many people behind it are running away to find accessories? Last week, a friend who started a wedding company complained to me that his rental screen was blacked out for 20 minutes when receiving the order because the power module was not matched, and the penalty for liquidated damages was compensated by five figures. What's even more annoying is that he bought the "original accessories" on Taobao. He opened it and found that it was filled with cement counterweights... Today we will talk about the most troublesome things for novices.——​ ​Where to find LED display accessories​​？

Guide to the secret pit of procurement channels

To be honest, there are so many ways to find accessories now that are dazzling. Let’s talk about the three most common ones:

1. ​​Second-hand disassembly parts market​​: The ones on the corner of the third floor of Huaqiang North, Shenzhen, marked "90% new" reception cards, which may actually be soaked in water. Last year, an engineering commercial card used this kind of card, and 17 modules were burned in three months.
2. ​​Special offer area for e-commerce platforms​​: Look at the price 30% cheaper, but pay attention to the details page - "Industrial grade" may have been tested for a room temperature environment for 1 hour
3. ​​Door-to-door sales agent​​: It was so vague with the sample book, but the annual purchase volume was signed starting from 500,000 yuan, and small merchants couldn't afford it.

There is a lesson learned by blood and tears: Don’t believe in the propaganda phrase “all systems are common”. Last year, the advertising screen in a shopping mall caught fire. It was found that it was a mismatched power box, and the temperature rise exceeded the standard by 60℃.

Must-buy accessories list

A common mistake for beginners is to buy a bunch of things that they cannot use. This table helps you clarify the key points:

Let’s focus on receiving cards: the mainstream ones on the market now carry 40,000 points and 60,000 points.​​The price difference can reach 300 yuan per piece​​. But pay attention to the pixel clock frequency, image tear will occur if the pixel clock frequency is lower than 20MHz. There is a customer who does cinema advertising and buys a low-speed card with a cheap price, and directly makes it into a PPT when broadcasting 4K film sources.

Price difference decryption

It is also marked as "outdoor waterproof power", why some sell 80 and some sell 280? The main differences are in these three places:

1. ​​Glue filling process​​: If you are really waterproof, you will wrap a 2mm thick triple-proof glue on the circuit board. If you are inferior, you will be coated with transparent paint like nail polish.
2. ​​Copper wire purity​​: If the power cord contains less than 60%, the shell can be desiccated after working for two hours with full load.
3. ​​Certification mark​​: Identify the CE/CCC steel stamp on the shell, the sticker is probably fake

There is a test trick to share with you: use an electronic scale to weigh the power module. ​ ​The 500W power supply with sufficient power must have at least 1.2kg​​, light and fluttering absolutely cut corners. Last year, I helped my friend inspect the goods. Three of the 10 power supplies were less than 800g. When I took them apart, I saw that even the heat sink was sprayed with aluminum sheets and black paint.

After-sales service

Nowadays, many sellers hype the "three-year warranty", but there is a lot of knowledge here:

• ​​Who pays the logistics fee​​: Return and exchange in remote areas, shipping costs may be more expensive than accessories
• ​​Testing standards​​: It is said that it is artificial damage and the seller has the final say
• ​​Response time​​: Promising a 24-hour response may be just an automatic reply "inspection"

It is recommended to sign when purchasing​​"Separation Parts Agreement"​​, black and white:

1. New parts are sent within 48 hours
2. Provide remote configuration guidance
3. Free firmware upgrade during warranty period

There is a colleague who is doing stage rental. With this agreement, equipment problems during peak seasons can be fixed within two hours, and the venue rental fee is charged no small amount.

New trends in future accessories

Recently, some new things have emerged in the industry:

• ​​Intelligent temperature control cable​​: Can monitor the connector temperature in real time, and automatically power off over temperature
• ​​Self-healing magnetic connector​​: If you are trampled and deformed, you can restore your shape after soaking in hot water for a while
• ​​Wireless transmission module​​: Replace traditional network cables, the transmission delay is controlled within 3ms

However, we should remind novices that these new technologies are currently of varying quality. Last month, a certain wireless module was tried, with a nominal transmission distance of 50 meters. The actual test was that the cement wall was blocked and the technicians on the scene were sweating profusely to stairs to debug.

The editor thinks that finding accessories is like matching Chinese medicine, and one must pay attention to the monarch, minister and assistant. When purchasing next time, you might as well bring a caliper and a universal performance site inspection.——​ ​Qualified wires must have at least 4mm outer diameter​​, when measuring resistance of multimeter, if the value is too large or too small, it will pass directly. By the way, I heard that there are manufacturers now working on accessories traceability systems, and you can scan the code to see the production process. If this becomes popular, how much worry can our buyers save...

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